Steam-boiler



(No Model.) 2 Sheets-Sheet L W. MALAM.

STEAM BOILER. No. 324,134. Patented Aug. 11, 1885.

F'JQJ.

2 Sheets-Sheet 2.

(No Model.)

W.- MALAM.

' STEAM BOILER.

No. 324,134. Patented Aug. 11, 1885 m1 ooooooooooooooooooo N\ W OOQQGOOOOOOOOOOOOOO 1 OOQOOOOOOOOOOOOOOOO m ooooooooooooooooooo ooooooooooooooooooo ooooooooeoooooooooe ooooooooooooooooooo OOOO OOOO 's GOO0 fe wm N1 PETERSv Phuln-Lhhognpher. Wnhinglon, D. C.

U ITED STATES PATENT UFEICE.

WILLIAM MALAM, OF EDGE MOOR, DELAVARE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 324,134, dated August 11,1885.

Application filed April 15, F885. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM MALAM, a subject of the Queen of Great Britain and Ireland, and a resident of Edge Moor, Delaware,

have invented certain Improvements in Steanr Boilers, of which the following is a specification.

My invention relates to boilers of the locomotive type, the objects of my invention being to increase the heating-surface of the boiler, to dispense with the usual crown-bars for the fire-box, and to so construct the smoke-box casing as to render any elaborate staying of the same unnecessary.

In the accompanying drawings, Figure l is a longitudinal section of a steam-boiler made in accordance with my invention; Fig. 2, a transverse section on the line 1 2, and Fig. 3 a transverse section on the line 3 4.

A is the outer shell or casing of the boiler; B B, the opposite ends, and D D the opposite sides of the firebox casing, and F the smoke-box casing, the usual tubes, G, running through the barrel of the boiler from the front plate, B, of the 'fir'e-box casing .to the front tube-sheet, H.

The sides and ends of the fire-box casing should be stayed, as usual; but instead of providing the fire-box with the usual fiat top or crown and the transverse bracingbars therefor, I arrange in the upper part of the fire-box water-legs J J, extending transversely across thefire-box and riveted to the opposite side plates of the same. These transverse waterlegs form part of the crown of the fire-box,

the crown being completed by narrow transverse plates K, riveted to the side and end plates of the firebox casing and to the shells of the transverse Water-legs J, and in order to impart the necessary rigidity to these crown plates they are made of the arched form shown in Figs. 1 and 2, or are corrugated, as shown by dotted lines in Fig. 1.

Through the transverse water-legs J extend short tubes a, which serve to stay the opposite sides of the shells of said water-legs, and add materially to the heatingsurface of the boiler.

I also utilize the smoke-stack M as heatingsurface by contracting the height of the smokebox casing F, and extending the barrel of the boiler forward, so as to inclose said smokeboX and the lower portion of the stack.

The shell or casing A of the boiler has near the front end a vertical drum, N, inclosing the upper portion of the stack M and-forming a stea1n-dorne,which may form the steam-domeof the boiler, as shown, or may be connected to the usual steam-dome on the top of the boiler.

In order to avoid the necessity of using an elaborate system of stays for the smoke-box casing F, I corrugate the same, as shown in Fig. 3, so as to impart to it a degree of stiffness sufficient to enable it to resist the external pressure to which it is subjected, the front sheet of the shell A of the boiler being preferably expanded, as shown, to accommodate this corrugated smokebox casing.

The utilization of the drum Nas the steam- 7o dome of the boiler is an advantage, as the supply of steam for the engine is thus drawn from the boiler at a point as remote as possible from the fire-box casing, where the water is constantly in a state of violent agitation, owing to the large area and intensely-heated condition of said fire-box casing.

It will be observed that the water-leg J nearest the front end of the fire-box is deeper than the rear leg, so that the latter does not obstruct the free passage of the products of combustion to and through the tubes of said front leg.

I do not claim, broadly, a boiler having tubed transverse water-legs, as many different forms of such boilers have been devised; but

I claim as my invention 7 1. The combination of the casing and tubed cylindrical barrel of a boiler of the locomotive type with a fire-box casing having tubed transverse water-legs in the upper portion of the combustion-chamber, as set forth.

2. The combination of the casing and tubed cylindrical barrel of a boiler of the locomotive type with the fire-box casing having 95 tubed transverse water-legs J, and crownplates K, as set forth.

3. The combination of the casing and tubed barrel of a boiler of the locomotive type with a fire-box casing having tubed transverse wa- I00 ter-legs in the upper portion of the combns- Slll0i0fi13ft0k, and the smoke-box havingztcortion-chamber, the forward leg being deeper rugeted casingmith the casing Aof the boiler than the rear leg as set forth. having an expanded front sheet inelosing the 4. The combination of the fire-box casing smoke-box, its set forth. 1 5 having tnbed transverse Water-legs, the tubes In testimony whereof I have signed my G, the smoke-box and stack, and the boiler name to this specification in the presence of easing extended to inolose the smoke-box and two subscribing witnesses.

lower portion of the stack, and having a drum, \VILLIAM MALAM. N, inolosing the upper part of the stack, as \Vitnesses: IO set forth. WILLIAM F. Diwi's,

5. The combination of the tube sheet, the I HARRY SMITH. 

